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DEPARTMENT OF AEROSPACE AND OCEAN ENGINEERINGSteady Flow Over a 6:1 Prolate Spheroid |
ABSTRACT
Velocity measurements were carried out on the lee-side of a 6:1 prolate
spheroid, ReL= 4.2´106,
at 10° and 20° angles of attack(a),
and at x/L= 0.600 and 0.772. The dominant feature of each
of these flowfields is the presence of a shed vortex due to cross-flow
separation. This is a source of considerable noise and vibration.
At a = 10°, high turbulence levels
is confined to the near-wall region. At a=
20°, the highest turbulence levels were measured away from the wall
at azimuthal (f) locations where the
flow is separating. Velocity spectra for regions with weaker 3-D
effects exhibit features that are observed for equilibrium flows.
Spectra in strong vortical flow regions show unusual and apparently non-equilibrium
behavior. This behavior has some qualitative similarities with the
surface pressure fluctuation spectra .
RELATED PUBLICATIONS
(Contain analysis of this data)
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Goody, M. C., Simpson, R. L., Engel, M., Chesnakas, C. J., and Devenport, W. J., 1998,"Mean Velocity and Pressure and Velocity Spectral Measurements within a Separated Flow Around a Prolate Spheroid at Incidence," AIAA Paper 98-0630 |
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Chesnakas, C. J., Simpson, R. L., and Madden, M. M., 1993, "Three Dimensional Velocity Measurements on a 6:1 Prolate Spheroid," Data Report VPI-AOE-202, Dept. of Aero & Ocean Engr, VPI&SU, Blacksburg, VA |
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Chesnakas, C. J., and Simpson, R. L., 1994, "Full Three-Dimensional Measurements of the Cross-flow Separation Region of a 6:1 Prolate Spheroid," Experiments in Fluids, Vol. 17, pp. 68-74. |
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Chesnakas, C. J., and Simpson, R. L., 1996, "Measurements of the Turbulence Structure in the Vicinity of a 3-D Separation, " Journal of Fluids Engineering, Vol. 118, No. 1, pp. 268-275. |
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Chesnakas, C. J., and Simpson, R. L., 1997, "A Detailed Investigation of the 3-D Separation about a 6:1 Prolate Spheroid at Angle of Attack," AIAA Journal, Vol. 35, No. 6, pp. 990-999. |
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Wetzel, T. G., 1996, "Unsteady Flow Over a 6:1 Prolate Spheroid," Ph.D Dissertation, Dept. of Aero & Ocean Engr, VPI&SU, Blacksburg, VA. DATA AVAILABLE ON WEB |
DATA AVAILABLE FOR DOWNLOADING
The following files contain LDV and hot-wire velocity measurements of the flow about a 6:1 prolate spheroid at incidence. The *.XLS files are Microsoft Excel workbook files. Some additional flow documentation is given in the *.PDF file as indicated below. You will need the Adobe Acrobat Reader in order to read the *.PDF file. The Adobe Acrobat Reader is available from Adobe free of charge by clicking on this link: Get Acrobat Reader .
NOTE: THE OUTER LAYER BOUNDARY LAYER VARIABLES (d*, q, Ue) GIVEN HERE SUPERCEDE THE VALUES POSTED IN THE JOURNAL OF FLUIDS ENGINEERING DATABANK
Flow about the Leeside of a 6:1 Prolate Spheroid at Angle of Attack
- Flow Documentation (DOC.PDF : 33 KB)
- Contains relevant boundary layer parameters (e.g. flow velocity, boundary layer thickness, etc.)
- Data Files
- a = 10°, x/L = 0.600 (16V.XLS : 161 KB)
- a = 10°, x/L = 0.772 (17V.XLS : 226 KB)
- a = 20°, x/L = 0.600 (26V.XLS : 232 KB)
- a = 20°, x/L = 0.772 (27V.XLS : 236 KB)